package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.PasswordConstant;
import com.sky.constant.StatusConstant;
import com.sky.context.BaseContext;
import com.sky.dto.EmployeeDTO;
import com.sky.dto.EmployeeLoginDTO;
import com.sky.dto.EmployeePageQueryDTO;
import com.sky.dto.EmployeePasswordDTO;
import com.sky.entity.Employee;
import com.sky.exception.AccountLockedException;
import com.sky.exception.AccountNotFoundException;
import com.sky.exception.PasswordEditFailedException;
import com.sky.exception.PasswordErrorException;
import com.sky.mapper.EmployeeMapper;
import com.sky.result.PageResult;
import com.sky.service.EmployeeService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;

import java.time.LocalDateTime;

/**
 * @author 顾无言
 */
@Service
public class EmployeeServiceImpl implements EmployeeService {

    @Autowired
    private EmployeeMapper employeeMapper;

    /**
     * 员工登录
     *
     */
    public Employee login(EmployeeLoginDTO employeeLoginDTO) {
        String username = employeeLoginDTO.getUsername();
        String password = employeeLoginDTO.getPassword();

        //1、根据用户名查询数据库中的数据
        Employee employee = employeeMapper.getByUsername(username);

        //2、处理各种异常情况（用户名不存在、密码不对、账号被锁定）
        if (employee == null) {
            //账号不存在
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        //密码比对
        //进行md5加密，然后再进行比对
        password = DigestUtils.md5DigestAsHex(password.getBytes());
        if (!password.equals(employee.getPassword())) {
            //密码错误
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        if (employee.getStatus() == StatusConstant.DISABLE) {
            //账号被锁定
            throw new AccountLockedException(MessageConstant.ACCOUNT_LOCKED);
        }

        //3、返回实体对象
        return employee;
    }

    /**
     * 新增员工
     */
    @Override
    public void save(EmployeeDTO employeeDTO) {
        // 前端传回来的是DTO类型，但是在mapper层处理数据的时候，需要用Employee实体类，因此需要进行数据的迁移
        Employee employee = new Employee();
        // 使用BeanUtils.copyProperties()方法进行数据的迁移
        BeanUtils.copyProperties(employeeDTO, employee);
        // 设置Employee设置其他字段的数据
        // 设置默认密码为MD5加密
        employee.setPassword(DigestUtils.md5DigestAsHex(PasswordConstant.DEFAULT_PASSWORD.getBytes()));
        // 默认用户的状态是启用   状态：1启用，0禁用
        employee.setStatus(StatusConstant.ENABLE);
        // 设置创建时间
        // 设置更新时间
//        employee.setCreateTime(LocalDateTime.now());
//        employee.setUpdateTime(LocalDateTime.now());
        // 设置创建人和更新人,设置为当前登录的用户
//        employee.setCreateUser(BaseContext.getCurrentId());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        // 数据设置完后，使用employeeMapper进行数据插入
        employeeMapper.insert(employee);
    }

    /**
     * 分页查询员工
     * @param employeePageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(EmployeePageQueryDTO employeePageQueryDTO) {
        // 这里因为返回的是PageResult类型，所以，我们要使用Myabtis的PageHelper进行分页查询
        // 再执行mapper层的方法之前，需要使用PageHelper进行设置当前页数和页数大小
        PageHelper.startPage(employeePageQueryDTO.getPage(), employeePageQueryDTO.getPageSize());
        // 再调用mapper层的方法
        Page<Employee> pages = employeeMapper.pageQuery(employeePageQueryDTO);
        return new PageResult(pages.getTotal(),pages.getResult());
    }

    /**
     * 启用禁用账号
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Employee employee = Employee.builder()
                .id(id)
                .status(status)
//                .updateTime(LocalDateTime.now())
//                .updateUser(BaseContext.getCurrentId())
                .build();
        employeeMapper.update(employee);
    }

    /**
     * 根据id查询员工信息
     * @param id
     * @return
     */
    @Override
    public Employee getById(Long id) {
        return employeeMapper.getById(id);
    }

    /**
     * 编辑员工信息
     * @param employeeDTO
     */
    @Override
    public void update(EmployeeDTO employeeDTO) {
        Employee employee = new Employee();
        BeanUtils.copyProperties(employeeDTO,employee);
//        employee.setUpdateTime(LocalDateTime.now());
//        employee.setUpdateUser(BaseContext.getCurrentId());
        employeeMapper.update(employee);
    }

    /**
     * 修改密码
     * @param employeePasswordDTO
     */
    @Override
    public void updatePassword(EmployeePasswordDTO employeePasswordDTO) {
        // 根据id获取用户
        Employee employee = employeeMapper.getById(employeePasswordDTO.getEmpId());

        // 如果用户不存在，则抛出异常
        if (employee == null){
            throw new AccountNotFoundException(MessageConstant.ACCOUNT_NOT_FOUND);
        }

        employeePasswordDTO.setOldPassword(DigestUtils.md5DigestAsHex(employeePasswordDTO.getOldPassword().getBytes()));
        employeePasswordDTO.setNewPassword(DigestUtils.md5DigestAsHex(employeePasswordDTO.getNewPassword().getBytes()));

        // 如果旧密码和原来的密码不一样，则抛出异常
        if (!employee.getPassword().equals(employeePasswordDTO.getOldPassword())){
            throw new PasswordErrorException(MessageConstant.PASSWORD_ERROR);
        }

        // 更新密码
        employee.setPassword(employeePasswordDTO.getNewPassword());
        employeeMapper.update(employee);
    }





}
